An unplanned roof fall occurred on the 011-0 MMU on section #2 in the #2 entry about 480 feet from the face. The fall was about 640 ft long, 18 to 20 ft wide, and 10 to 12 ft high. The area was timbered and dangered off. This area was bolted with 5 and 6 ft torque tension bolts. The section moved to new set-up.